摘要
本文利用EISCAT雷达资料讨论磁层-电离层耦合的高纬电离层效应。研究表明,即使在夏季极昼情况下,磁扰期间的磁层过程对高纬电离层形态的影响也远大于太阳紫外辐射的作用。高能粒子沉降使电离层E层的电子密度大大增加;而磁层对流速度变大会使F层内电离复合加强。因而,磁扰时经常出现n_e(E层)>n_e(F层)的情况。此现象不仅与宁静时完全相反,而且与中低纬电离层形态变化也有很大差别。
The data observed by EISCAT are used to study the effect of the magnetosphere-ionosphere coupling on the high latitude ionosphere.A case shows that during magnetic storm,even on long summer days,the influence of the magnet ospheric processes on the morphology of the high latitude ionosphere is quite important in comparison with that of the ionization of the solar extreme ultreviolet radiation.The electron density at E-layer significantly increases due to the precipitation of energetic particles from the magnetosphere,while the enhancement of the mag-netospheric convection velocity may accelarate recombination of ionization components with neutral atmosphere and cause the nc decreasing at the F-layer altitude.So,usually,ne(E-layer)> ne(F-layer) during magnetic disturbed period.The morphology is not only entirely changed from the quiet period,but also much different in comparison with that at middle and low latitudes.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第3期262-269,共8页
Chinese Journal of Geophysics
关键词
高纬
电离层
电子密度
电子温度
Ionospheric electron density
Electron temperature
Ion temperature
Plasma drift velocity
Magnetospheric convection
Particle precipitation
